Coal or rock drill



(No Model.)

J.'L. WILLIAMS.

GOAL 0R ROCK DRILL.

No. 357,748. Patented Feb. 15, 1887.

INVENTOR ATTORNEYS WITNESSES W e;

Lilhognphor, Washinglcn. u c.

NITED STA ES PATENT OFFICE,

JOHN LLOYD \VILLIAMS, OF SHENANDOAH, PENNSYLVANIA.

COAL OR ROCK DRILL.

SPECIFICATION forming part of Letters Patent No. 357,748, dated February 15, 1887.

-Application filed Ju'y I, 1856. Serial No. 207,331. (No model.)

To all whom, it may concern:

Be it known that I, JOHN LLOYD WILLIAMs, ofShenandoah, in the county ofSchuylkill and State of Pennsylvania, have invented a new and Improved Goal or Rock Drill, of which the following is a full, clear, and exact de scription.

My invention relates to drillingmachines more particularly of that class used in drilling coal or rock in mining operations; and the invention has for its object to provide a simple, inexpensive, durable, and effective drill of this character which may be operated with economy of time and labor.

The invention consists in certain novel features of construction and combinations of parts ofthe drilling-machine, all as hereinafter fully described and claimed. 1

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure 1 is a side view of myimproved drill, partly broken away and in section, and as applied to use, and Fig. 2 is a cross-sectional elevation taken on the line a: .r, Fig. 1.

The main bar or stock A of the drill is preferably provided at its forward end with a series of teeth or spurs, a, adapted to be forced into the side of a hole, b, made in the coal or rock B, operated upon by means of a wedgeO, driven into the hole I) by blows given on the back end or head, 0, of the wedge. To the wedge there is connected',preferably by a pivot 5 joint at d, the forward end ofa brace rod or bar, D, the back end of which enters a slot, e, made in a heavy lug or flange, E, formed on or fixed to thc'main bar A. The back end of rod D is screw-threaded, to receive a pair of lock or jam nuts, (1 d, which, when the wedge Ois driven tightly in the hole b to bind the bar A in the hole, will be screwed hard up to opposite faces of the lug E, as shown in Fig. l of the drawings, and whereby the main bar will be stiffened and strengthened to give substantial support to the drill-operating mechanism which it carries, so that the drill will work with little or no vibration and its operation be made more easy and effective than it otherwise would be.

At the back end of the main bar A there is provided a semi-spherical socket formed partly in the bar and partly in a plate, F, held to the bar by bolts G G, and in this socket is fitted a ball-bearing, H, which may be cast with the head-piece or nut I, but which I prefer to make separate and with threaded stem 72 which passes through the lower end of the headpiece and receives a nut, h, within a slot, 1', of the head-piece, as shown in the drawings.

The top 2' of the head-piece I is internally threaded to receive the hollow screw feed-bar J, which is provided at the outer end with a handwheel, K, and in the bar Jthe spindle L of the drill is fitted to turn freely. The spindle head or socket Z, in which the drillingtool M is held loya set-screw, in, or otherwise, abuts one end of the feed-bar J, and the handcrank N, by which the drill-spindle and drill are turned, abuts the other end of the feed-bar, and whereby as the feed-bar wheel K is turned one way the drill M will be fed or forced forward to cut deeper in the coal or rock, and as the handwheel K is turned the other way the drilling-tool will be withdrawn from the hole. The crank N has the usual extension bar or lever or, allowing it to be worked more easily by both hands.

It is ocvious that when the nuts of the bolts G are loosened the ball-bearing H may be turned in its socket to set the drill at any required angle up or down or to either side, and when the nuts are again tightened the ma chine is ready for work, and the drillingtool will operate effectively in any position.

I make the drilling-tool M preferably with three cutting points or teeth, in, m m, which assures quick cutting action, and with the twist of its body portion increasing in pitch from the point to the heel or back end of the tool,which increasing twist of the spiral body of the tool makes it self-clearing, so thatthe cuttings of the tool will not bind or clog it in the hole, but will be carried backward and discharged as fast as made, which insures the free and easy working of the tool to any required depth,and without waste of the strength of the operator, as will readily be understood.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The drilling-machine comprising thefeedscrew with its inelosed tool-carrying spindle, the head-piece or feed-nut carrying the feedserew, the main bar or stock having a universal-joint connection with the feed-screw and 5 provided with a toothed or serrated forward end, and the wedge connected by a brace-rod to the said main bar or stock, substantially as shown and described.

2. In a drilling-machine, the combination,

IO with the main bar or stock A, provided with a lng, E, and a wedge, O, of a brace-rod, D, connected at one end to the wedge and entered at its other end in ahole or slot of the lug E, and jam-nuts d on the rod D, substantially as der5 scribed, for the purposes set forth.

3. In a drilling-machine, the combination,

with the main bar or stock A and the head- JOHN LLOYD 'wILLIAMs.

Titnesses:

D. P. FAUST, S. G. M. HOLLOPE'LER. 

